Peoria:

Coldest temperature observed: 16 degrees below zero, on January 1. The last time it was colder than this was January 16, 2009, when the low was 21 below zero.

The high temperature on January 1 only reached -2 degrees. This was the coldest New Year's Day high temperature on record. The old record of 3 degrees was set in 1928, and tied in 1974.

Since records began in 1883, there have been 48 days where the high temperature has failed to reach zero. The last time this occurred was on January 6, 2014. This was only the third occasion since 2000 with a subzero high.

Coldest reported wind chill: 32 below zero on January 1 at 5:54 am (temperature -15, wind 8 mph). This was the coldest wind chill reported since January 6, 2014, when it reached 36 below zero. (Wind chill records are not kept, due to it being a calculated value vs. a direct measurement like temperature or wind.)

Springfield:

Coldest temperature observed: 13 degrees below zero on January 1 and 2. These were the coldest observed temperatures in Springfield since February 27, 2015 (14 below zero).

The low for January 1st tied the record for the date, set in 1974.

Coldest reported wind chill: 30 below zero on January 1 at 4 am (temperature -9, wind 13 mph). The last time it was colder was on January 6, 2014, when the wind chill was 38 below zero. (Wind chill records are not kept, due to it being a calculated value vs. a direct measurement like temperature or wind.)